So recently, my 2013 G37 Sedan (160k miles) 7AT's acceleration has been bogging (accelerating much slower than it should be when you push the pedal) and I cannot figure out why. It will fully accelerate all the way up on the RPMs in every drive mode (D, DS, me manually shifting in DS mode), no check engine light, and there is a sound, but I need to go back and have my cats checked again to ensure the job was done properly..I think the sound is unrelated and my buddy works at an Infiniti dealership and told me thats likely not the cause of my car bogging.

I have K&N drop-in air filters, I recently cleaned the MAF sensors (the screws broke that hold the sensors in place and idk what size to replace them with, but that's another problem that's being held in place by duct tape), as of a few months ago, I replaced the Tranny, the engine was replaced by the dealership for free at about 90k miles, my alternator is brand new, and the most recent thing I had done to it was that I teplaced the OEM cats with Kinetic High Flow Cats. Now before you go blaming the cats (which could be the problem idk), the car ran perfectly fine after they were replaced and the bogging seems to be a new issue.

 

Can you describe what you mean by "bogging?"

 

Accelerating much slower than it should be

 

It's possible that you have a vacuum leak somewhere if one of the fittings wasn't tightened all the way. I would check over all of the fittings where air could be getting into the intake system between the air filters and the engine.